This question already has answers here:
How do I convert a String to an int in Java?
(47 answers)
Closed 6 years ago.
For some purpose, I want to convert the String to my Unicode to int or long or double. I just need a number. Can anyone tell me how can I do that?
If you want to get primitive values, use :
Integer.parseInt("12");
Long.parseLong("1024");
Double.parseDouble("1.52");
If you want to get objects corresponding to these values (Integer object, Long object, etc), use :
Integer.valueOf("12");
Long.valueOf("1024");
Double.valueOf("4.17");
Related
This question already has answers here:
When to use wrapper class and primitive type
(11 answers)
What is the difference between Integer and int in Java?
(11 answers)
Closed 1 year ago.
This post was edited and submitted for review 1 year ago and failed to reopen the post:
Original close reason(s) were not resolved
I know that Integer is a class and int is just a number, but when should we use one over another and how to convert Integer to int (and vice versa)?
** Also, there is this
question (what is autoboxing by the way) but I am asking WHEN to use int over Integer in actual programming (such as performance issues, ease of use and readability) and vice versa and not the DIFFERENCE between them.
This question already has answers here:
Is it possible to overload operators in Java? [duplicate]
(6 answers)
How to compare two double values in Java?
(7 answers)
Closed 2 years ago.
I have created a class for complex numbers and a constructor for the class which takes 2 doubles, like
Complex c = new Complex(3.0,1.0)
Then how do I compare a Complex number to 0? I know that I need to create a tolerance number, say
TOL = 1.0e-10
Do I just do this:
Complex NullComplex = new Complex(TOL,TOL);
c >= NullComplex;
I would like to get a boolean output from this. But whenever I want to compare, I get that the operators "=>" are undefined for the type double, Complex (or Complex, Complex)
This question already has answers here:
Java 7 underscore in numeric literals
(8 answers)
Closed 4 years ago.
int x = 100_000_5;
System.out.println(x);
Instead of throwing an error it prints the result 1000005. If this is a valid case what other abnormalities are there with Integer?
int x = 100_000_5 is same as int x = 1000005. JVM7 allows to write literals with more readable format, e.g. separate groups.
See more in Primitive Data Types
This question already has answers here:
How to convert number to words in java
(31 answers)
Int to English words in Java
(4 answers)
Closed 9 years ago.
I search but cannot find on the web.
Is there a function that can represent any integer into its String litteral representation ?
Example :
Integer i1 = new Integer(4);
Integer i2 = new Integer(30);
i1.callSomeFunction();
i2.callSomeFunction();
Output :
"Four"
"Thirty"
If you know another function which isn't in the Integer class, it's fine too.
There is no standard method to do this but take a look at this. There is an example for a number to words in the English language converter.
This question already has answers here:
Closed 10 years ago.
Possible Duplicate:
How to convert hex string to float in Java?
i want to convert hexadecimal value into equivalent float value in java.
Ex.What is the output of 000C (hexa value) ?
Thanks in advance..
Read the hex as an integer and use intBitsToFloat.